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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c2795d769acc8145d2009d71edfc21d4fd123a95ed5381f9b039f5b498dbd88' 
  AND token = 'KRc3+smjNl/Q8qrtxF0n3vuB3T2fha68Uc5XEXypeQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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