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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a4ef611ab714cfe3dbaadbbbfe60d1ba9b1f955178992f549b2ff11dd9d5d4e' 
  AND token = '5JS0pMcrPSHydDc/duAuUx2dulIWgkAQwYE1E8Fs7EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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