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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e83a09a70d5d0e58d235460960d2f9fbae5fd6b4373ad4595a2999fac3353851' 
  AND token = 'oeNqbTiZG3Af+t3H1V3XCEMRcpIfPjL3rWoBpoPfYR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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