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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '11fccf80d77a13568a9127e2efdd7c3f87c25d21cb1e765cb2a4e7a94daba2ca' 
  AND token = 'oazSn2kQaawQJvMc/W2+O7MVIFzzljMLMauh307JN78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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