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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55586019095d570b60fc0992a7195cc79cc2c55ec3a6743ff456d22965d2c0a8' 
  AND token = 'm6I/kjRowO9ASE5pMUtWe5dw2evSBswm5EFXpwRpBGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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