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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'caa54e21eb332cd9c08d303b9c941b686e3965fd6011be996573efe8c770d3a7' 
  AND token = 'wm3i8cmS0DqyKwdEWs5p3Emf7iXF+c47m7abu85wRhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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