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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '03119568c76cf36532d2b3eacf327e32e830c36ac075fadc61a5def65f382602' 
  AND token = 'ipRHVSRAThsckPIlRMfQTdW+VTH/kJ7RG1i/CiE7EFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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