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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0e58f141348a01b792cdadaa1606f9bb724845caf9c6357df6823564aa8d60a0' 
  AND token = '7cmn6eO06rEHHgv6n5gJnrHLvpNelMtELlmcAkNn1q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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