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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e2dbab6b7e67c2a9765502aafd547c9e6166931bb53615cd74a19cae1c4e8a61' 
  AND token = 'oB4FGeyzOSY9gpQ8Sp8NCNWQHHarU2ycw3w4kD91oMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}