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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '55187f901705d785d3fe67a1060b168d0dd1637ce1559cf77be60fe6ef6a03e1' 
  AND token = 'hVp0MCdxEi/RjhR36XQO5xed4sZ7csHmLP6nMCaJwi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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