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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58d28278aeba0aa5e483d88e70e0e4467eaf67cb40998b1b04a5021828f06c84' 
  AND token = 'nT3p3t58HTJG5qm3e4WUbFF7DS5ObHMIQN6JM2fxT24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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