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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a18ebf84cf595898170cd5994a708d57fb6d5702f391ef610889a75fbdafd955' 
  AND token = 'NFZtRUAi+utLOrQtBhLPVz2u24dN2h+FoVoddIz1UE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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