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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2b24a0b73b51d129c2566445896d737ac9e3385a6f3e50f8d5ade0270b2d129a' 
  AND token = 'Wx9N4y2Iwm0lAkaFP55y95IeyQyY9RmYDm/dzcOJDh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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