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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '26b444546a5be0f4666f1fe515d5432fce793f9f3842cd91f1f11dd2d42e79c1' 
  AND token = 'T3knVjT3x120to7v++ouTWLXOg3Tp/RrEqwYkbr6rnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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