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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e91786fd62ffda16e2ff6818dcb10c492b4fb64350b47cc6b7b283a6f6d8f69' 
  AND token = 'TBmrRD1KJQykL8Z/2NEDsRjiLI9KDDMDsp1CmKQ/G7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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